Another vote for the Prodigy line. But you're right, not much free real estate on that dashboard. Maybe near one knee on the bottom part of the dash... but that might be in the way of your knee!
The aft tanks will work to your advantage. The Equal-i-zer brand works well for built-in sway control, it steadied my 23'er very well against the 111" wheelbase I was towing with.
We have had some past discussions here on the forum, I think, about whether WD hitches count as tongue weight. The thing is, any weight that physically rests on the receiver is hitch weight, right? And a WD hitch's weight rests on the receiver, right? So the next question is, what happens when we use the bars to "distribute weight" fore and aft of that assembly? On the receiver mounted to the vehicle, some of that hitch weight is taken off the rear mounting bolts and moved to the front mounting bolts (where it makes the vehicle a lever to load some weight onto the front axle)... but it's still there, affecting the receiver and its mounting bolts and whatever they screw into. However, there is some amount of weight that is moved back onto the A frame, where the bars pull down on it, and from there it affects the weight riding on the trailer's axles. This latter amount of weight can be subtracted off the "hitch weight," I believe, but I don't exactly know how to calculate that amount, because it would vary depending on each vehicle's wheelbase and the hitch-to-axle distance of each trailer... as well as how the WD hitch was adjusted.